Variation of target strength by swimming orientation and size for Pacific herring (Clupea pallasii) at the frequency of 70-kHz

Park, Miseon; Yoon, Eun–A; Hwang, Kangseok; Lee, Dong-Gil; Oh, Wooseok; Lee, Kyounghoon

doi:10.3796/ksft.2017.53.4.396

Cited by 2 publications

(4 citation statements)

References 13 publications

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“…Therefore, it is highly likely that the echoes detected in the mooring system will be mainly from Pacific herring larvae. [23]. The TS range of the smaller herring from 7.9 to 16.2 cm was −48.84 to −42.60 dB.…”

Section: Discussionmentioning

confidence: 82%

“…Pacific herring have a swimbladder [23], and echo data from fish with swimbladders may be distinguished from echo data from zooplankton or fish without swimbladders [24]. The length distribution of Pacific herring larvae collected from Jinhae Bay during winter was found to be 5~27 mm using an RN80 net in 2011 [9].…”

Section: Discussionmentioning

confidence: 96%

“…The length distribution of Pacific herring larvae collected from Jinhae Bay during winter was found to be 5~27 mm using an RN80 net in 2011 [9]. The acoustic target strength (TS; dB re 1 m −1 ) of Pacific herring at 70 kHz is between −72.8 and −58.2 dB from 5 to 27 mm, respectively [23]. On the other hand, the zooplankton community in Jinhae Bay is mainly composed of large copepods, Acartia omorii and Centropages abdominalis, in winter and spring [25].…”

Section: Discussionmentioning

confidence: 99%

“…In data analysis, the MVBS technique was used to remove zooplankton echoes within the 38 kHz echoes [12], while fish echoes were removed from within the 120 kHz echoes [21]. The 70 kHz echoes obtained by the mooring system differed significantly from those of larval Pacific herring having swimbladders [23] and large copepods mainly distributed in Jinhae Bay [25], with the largest difference being more than 27 dB per single individual. Therefore, the purpose of acoustic data obtained by the ship-type acoustic survey is to detect adult herring moving to the spawning ground in Jinhae Bay and to identify the spatiotemporal distribution.…”

Section: Discussionmentioning

confidence: 99%

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Small-Scale Spatiotemporal Pattern in the Spawning of Pacific Herring (Clupea pallasii) in the Jinhae Bay, Korea, Estimated Using Hydroacoustic Survey

et al. 2021

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Acoustic surveys were used to locate coastal Pacific herring (Clupea pallasii) spawning grounds, and the spatial and temporal patterns of their spawning in Jinhae Bay, Korea were examined. We deployed mooring with a newly designed autonomous echosounder for ~70 days during the Pacific herring spawning season in Jinhae Bay, from January to April 2018. At the same time, ship-based acoustic surveys were conducted to identify the spatial distribution twice, at 38 and 120 kHz, onboard the fishing vessel in January and April 2018 in the bay. Fish school signals, including those from adult Pacific herring, are often detected through ship-based acoustic surveys in January, from outside the bay. In the spring, weak scattering signals from fish larvae and zooplankton were continuously detected inside the bay. Backscatter at the mooring in the center of Jinhae Bay was low from mid-January to early March, gradually increasing to higher levels until the end of March. The backscatter observed from the mooring correlated well with ship-based acoustic surveys in the center of the bay. This study proposes that the mooring type acoustic echosounder is a valuable tool for temporal abundance information and other aspects of fish behavior.

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Section: Discussionmentioning

confidence: 82%